This week once again saw violent scenes on the streets of Ferguson, Mississippi in the United States following the decision not to press charges against a white police officer who shot a young black man dead. Many of the television networks chose to air President Barack Obama's speech calling for calm on a split screen with footage of the violence on the other side - putting in sharp juxtaposition two faces of black America. Chris Campbell of the University of Southern Mississippi explains how the question of race has been dealt with in the US media since this story broke.
